I can hit up Compare Foods or some of the Mexican carniceras on my way home from work. I'm also going to take a look at What's Your Beef since it's right around the corner from me. The website looks pretty encouraging.
Thanks to all of you for your replies! I appreciate the links too.
I've seen a couple grocery stores sell beef liver from time to time, but I'm looking for a more reliable source that has this stuff pretty regularly.
Do any of the butcher shops in the Charlotte are carry tripe, beef heart, pork livers, etc?
I'm near Ballantyne in South Charlotte, so I'm going to try The Meat Market after work, but am not expecting to find exactly what I'm looking for.